Malicious PDF — malware analysis report

Static analysis result for SHA-256 525558ca48816e7e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 13:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 675b73f5e6fce4d6a39f926f223439d0 SHA-1: db665591b02b69c90e7523c5c3da5b33f669859d SHA-256: 525558ca48816e7e4bcd1928408c528df160bf4f7b582c5da036ab92f642200c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, a common technique for directing users to malicious sites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=android+phones+spying+on+you PDF link annotation
    • https://oancora.com/ckfinder/files/23387089829.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/keboridazileburorala.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/29690031151.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091514513012.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/zidefebukopuluf.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e05ec321a15586d65df32b95461422e7/lijotejugemi.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/falifafosoberor.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/xobixavi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f545ab9c7e89a65aae138e875b7bf67a/92375663842.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/durefivesobamorur.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/saruderu.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/saketufi.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/xafewurate.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614274e0b7717---80607420842.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913143630367329.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/ruxaperosoxabaripopodu.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77152572984.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/91483155386.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/zejesajugulugemepuxotawaz.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/37351718342.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/fewatasemuwana.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/riletukenugumiz.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ef1ce6f67dfc0d623bd33aa99dcf9775/84145508124.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910040422709853.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/53987250572.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/31335648282.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 16296 bytes
SHA-256: 05578bc2f3a788edbf7a1bb67fd921df7e9dff06857804319fd79e8ad1b9e5f2
font_02_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 10560 bytes
SHA-256: 4925af700ea225408afddb3443dc4dfecfabd9ca7a93fc67410eb854f2201c16

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